Since \(\mathfrak {F}_{i,j,k}\)  can be written in (REF ) and \(\delta _{i,j,k}\)  with \(k=1,2\)  are polyhedral functions, by [1]} (Corollary 5.2), we conclude that
\(L_{GY}^A\)  is a KL function of \((u,l_1,l_2)\)  with KL exponent \(1/2\) .
